Thread-cutter for sewing-machines.



PATENTED FEB. 27, 1906.

s. MBNDEL.

THREAD CUTTER FOR SEWING MACHINES.

APPLIOATION FILED AUG.15, 1905.

Winesses UNITED sures PATENT OFFICE.

SOPHIE MENDEL, OF NEW YORK, N. Y., ASSIGNOR TO BENJAMIN EDMUND DAVID, OF NEW YORK, N. Y.

Specification of Letters Patent.

Patented Feb. 27, 1906.

Application filed August 15, 1905. Serial No. 274,258.

To all whom it may concern Be it known that I, SOPHIE MENDEL, a citizen of the United States, residing at New York, city, Manhattan, county and State of New York, have invented new and useful Improvementsin Thread-CuttersforSewing-Machines, of which the following is a specification.

This invention relates to a thread-cutter for sewing-machines which will sever the needle-thread as well as the bobbin-thread below the goods sewed, so that the obj ectionable tearing by hand, of the threads above and also below the fabric is entirely dis pensed with.

In the accompanying drawings, Figure 1 is a plan of part of a sewing-machine provided with my improved thread-cutter; Fig. 2, a longitudinal section of Fig. 1 Fig. 3, a plan of the cutter, showing the hook partly retracted Fig. 4, an enlarged longitudinal section through the cutting-post; Fig. 5, a horizontal section on line 5 5, Fig. 4; and Fig. 6, a cross-section through the guide on line 6 6, Fig. 1. Fig. 7 is a cross-section on line 7 7, Fi 2.

lhe letter a indicates the table of a sewingmachine of suitable construction- I) is the work-plate, c the needle, d the bobbin-case, e the bobbin, f the needle-thread, and g the bobbinthread, all as usual.

Transversely to the work-plate I) there is secured to table a a grooved guide h, having undercut flanges h, that engage a rectilinearly movable slide i. The work-plate b has an undercut groove 6 in alinement with guide h, such groove forming a continuation of the guide for the accommodation of slide '5 when the latter is pushed forward. The

groove 6 extends beneath slidei and is here contracted, as shown in Fig. 7. To limit the backward movement of the slide, the guide h has at its rear end a stop 7L2, which constitutes an abutment for the slide.

To the lower side of slidei there is secured at j a hook j, which extends beyond the forward end of the slide and is contained within the lower contracted portion of groove 6.

The assemblage of the parts is such that the vertical plane of movementof the hook lies between needle 0 and bobbin 6, while the reach of the hook is such that when it is moved forward its beak j will be projected beyond the needle-thread f and the shuttlethread g, Fig. 1. Within the lower contracted portion of groove 1) projects upwardly a slotted post 75, that embraces hook j and constitutes a guide for the same. The forward edges of post is are beveled or sharpened to form a pair of cutting edges or diverging knives is, Fig. 5. The post 7c thus assumes the double function of a guide and of a cutter.

To advance the slide, it may be connected to one end of a coiled spring 6, the other end of which is secured to a depending lug b of work-plate 1). Normally the slide 1' is pushed forward so that the \beak j of hook is located in front of the threads f and g. When the piece of sewing has been completed, the needle-thread f is somewhat slackened above the needle by hand. The slide is then retracted so that the hook grasps both threads beneath the goods and carries them against the cutting edges k" of post is, so that the threads are thus severed. During this movement the drawing out of the needlethread through the goods and under the work-plate is rendered feasible owing to the slack previously formed in the thread above the goods. After the threads have been cut the slide i is advanced by hand by spring Z to assume its normal position ready for the next sewing operation.

It will be seen that by my invention the objectionable tearing by hand of the thread above as well as below the fabric is entirely dispensed with, that the severing of the threads is quickly performed, and that the ends of both threads will depend from the same sideviz., the bottom of the goods. Further, as the hook moves in a rectilinear or axial direction at right angles to the work plate and between needle and shuttle it will positively engage both threads f and g and carry them back against the knife-edges uniformly and to an equal extent.

What I claim is 1. In a sewing-machine, the combination of a plate having a groove, with a sharpened slotted post projecting into the groove, and a slidable hook engaging the post, substan- Signed by me at New York, Manhattan,

tially as specified. New York, this14th day of August, 1905.

2. In a sewing-machine, the combination SOPHIE MENDEL of a plate having a groove, With a sharpened 5 slotted post projecting into the groove, a Witnesses:

slide, and a hook secured thereto and em- WILLIAM SoHULz,

braced by the post, substantially as specified. FRANK v. BRIESEN. 

